Underfeed stoker



F. KOENIG.

UNDERFEED STUKER. APPLIQATION FILED DEC. 19. 1918.

Patented Oct. 11, 19211..

INVENTOH WITNESSES following is a specification.

FREDERICK KOENIG, 0E PITTSBURGH," PENNSYLVANIA.

UNDJEBZJFEED STOKER.

Specification of Letters Patent. Patntgfl @0811], 1111 119 211,

Application filed December 1a, 1912. Serial No. 267,480.

, in general to nnderfeed stokers for locomotives; and has reference more particularly to improvements in the means of support for that type of My present invention relates furnace grate ordinarily used in connection with such underfeed structures; Heretofore, the raised edges or upper portions of the fuel charging troughhave been relied upon to. marginally support the grates, but

. as these portions were subject to the destructive effect of the fire it has been found necess'aryto remove and replace them at frequent intervals, practically every few weeks under normal conditions of service, and this replacement consequently necessitated the concurrent removal of the grates before such Q portion 9 and the upper portion 10 are proreplacement could be effected.

One of the principal objects of the inven- I tion, therefore, is to so organize the trough as to provide a support for the grates which is remote from the fire and its shoots, and which at the same time permits the upper raised edges of the trough to be readily removed and as easily replaced without in any way disturbing the grates. Other objects of the invention in this connection relate to the provision on such raised edges of grate elements adapted to coiiperate with corresponding elements of the grate, together with the mounting of the grate shafts in the aforesaid support; and the provision of a til sectional trough construction composed of removable parts, one of which is designed to cooperate with the grate bars and to be removed without disturbing the other part which serves as a support fort-he grate and its shafts. 1 i

These, together with snch'other objects as may be hereinafter described, or are incident to myinvention, T attain by means of a construction illustrated in preferred form in the accompanying drawings, wherein- Figure 1 represents a top plan 'view. of

a set of furnace grate sections and their charging troughs n whlch my invention 18 embodied; and

Fig.2 is a view in vertical section thereof, a taken along the line 22 of Fig. 1.

Referring to the drawings, the reference characters 3, 4: denote'the inner and outer sheets, respectively, of the fire box A within which are mounted the fuel charging troughs B. These troughs, of which two are here shown, serve, in conjunction with supplemental y feed. apparatus (not shown), to supply fuel toward and'upon the grates G and D in the usual manner. As shown, these grates include agitator shafts 5, and the sets of grate bar elements 6, 7 and 8, adapted to be rocked by the shaft when the latter receives actuation. The construction thus far described represents nothing but what is old and well-known in this art; and in itselfv forms no distinct ventlon.

part of my present in- In carrying out my invention, each side wall of the troughs B, above its lower por-.

tion 9, preferably comprises the raised edge or upper portion 10 and a cast steel inner side piece 11 seated between the upper edge of the lower. portion 9 and the shoulder 10 of the raised. edge member 10. The lower vided with flanges 9 and 10 respectively, which abut the marginal back portions of the side piece 11, as shown in Fig. 2.

This arrangement prevails throughout both troughs, as will be understood, thoughof the manner"illustrated, Inthe case of'the central grate D, each grate supporting struc' ture proper will then, asindicated, comprise the side portions12 having a bearing bar 13 at eachend, while in the instance of either side grate C, "it; will include the bearing member's-13, a si de'portion 12, and a complementary side p'ortion 12" mounted against the lower portionofthe'inside sheet 3' of the fire-box.v The-raise'd portions 10 and said side portions 12 are provided with fixed grate elements 17 and 18 which respectively cooperate with the movable grate members 6 and already described.

To remove a raised member 10 when such removalbecomes necessary by reason of the disintegrating effect of the tire upon it the upper row of bolts is uncoupled whereupon the raised edge may be lifted out without disturbing the grate or the existing relation of the support with reference to the grate and trough. in some cases it may be found necessary to slightly loosen the nuts of the lower row of bolts in order to more readily allow of such removal, but in any such event the supporting relation remains undisturbed since the rib 12 of the side portion 12 would still rest upon thepositioning portion or flange 9 of the trough base. The" member therefor provided ,with a fixed lower portion and a detachable upper portlon, and

means for. supporting the grate from the lower portion so as not to interfere with detachment of the upper portion.

2. In an under-feed stoker, the combination with a grate and its'shaft, of an underfeed trough member provided with a detachable upper portion terminating in a planeapproximating that of the upper face of said grate, and having a lower portion provided with laterally extending grate sup porting means constituting a bearing for said shaft.

3. in apparatus of the character described, the combination of a grate and its shaft. a grate charging trough having a side wall thereof provided with a detachable upper edge portion and a detachable side port-ion, said. side portion provided with laterally extending grate supporting ineln hers positioned and formed to constitute bearings for the shaft of said grate and detachable clamping means for said portions.

a. In an underfeed stoker. the combination of a grate section having inovahle'grate elements. and a trough for supplying fuel to said section having upper and lower side wall sections, said' lower section constructed and arranged to support the grate sectioiu and said upper section detaelnihl vonnectvd with said lowersection and provided with fixed grate elements cooperating with said movable grate elements.

5. In an und erfeed stoker the )111l)illl tion of'a grate, a feed trough constructml to provide a. means of support for said grate and havingan upper edge portion disposed incontiguity with but removable independently of said'grate.

(3. In anfunderfeed stoker. the combination with a grate of a trough having a relatively fixed lower portion, a reinovahle upper portion and means for supporting the grate from the lower portion in such manner as to permit renro *al of the upper portion without removal of the grate.

FREDERICK KOENIG. 

